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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15fae0b359a388dff6b6857f11c971d9df73c9856fb4483e0bf67e4e4cda3fe3' 
  AND token = 'v84XSINzbARmN6jTc71HvbOF7qfpLSH6OfgsGMR/gz4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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