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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5a92e0b09bf815d856d472f556e3935ee3746e674111817cf633c710cac2374' 
  AND token = 'I2kJfws/h0Rshf/C5+BVbIvUVf28y/JAbxcJD7xaPP0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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