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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '569b3a045e46e35ce2945c86f02487862acbd935279bdb189d011af9d086b017' 
  AND token = 'ZuupE9n8wpHUTEyPRWV53iRz8x+O9E74gZgZOxCGaMc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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