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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '48a78e7a6df79b4240dec9dfd734f049a12ed78d53b1bb2180a905697fa813c6' 
  AND token = '6oDOhJSSuW2y9jQjGDyMpT4Mdl/Nac1dRs0uXW4q/pQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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