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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c15180893343c2264bf3b7b92a6373a8c6a2d4336b1ef229ac28cb5303bb9061' 
  AND token = 'MkEadEzgjb1AS2uddyR3jbBdzAsWwrHVFE58YIR19rU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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