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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13c4b02c25755eb48ba20464216d22fd2011b7f9d6cd3f03416dda3ca7e95273' 
  AND token = 'bE+bQgcF64YBJKzlKH4OMT0KzEOklzqiO3DEN8wuyWs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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