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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09e5b790738d8be6d9bef55806f70c3b9369fd4a575301f6fdee0d8530caa222' 
  AND token = 'CvYnGuCkkqC4TR4udlRoxB6onnQHgtqFY/4yRBJP0gI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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