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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec3e4beeb6ad041f313e2097846c01f161374f107f5e93b7ae518642e9038942' 
  AND token = 'pbobT39+jCP0+eyL4xwc9+pV54IcigMxJX4cBrGasC8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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