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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6bccbdb252f1329973d01c9ebc1ec027560437742b9245075bd5148f958671a8' 
  AND token = 'lvN52djFYldE2fS4k5vYm/epn5Rjb1PADQqcTP+LVtY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}