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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07aa87b90c0494a4798287a20ce1cd42cdf3e9705d0977ddeaaea4cc435e6cec' 
  AND token = 'EVn+r1V0mrNZm5NyXe8RqVx/eGMPbQG8ToQqAfsH9vI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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