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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e610dfb6c177ddc674a3a1ab159750532c068ac06a52fbb4836c3d96bc187ba0' 
  AND token = '51NzoLwNHwZMaqZfxYut9Owa6VH3F/uctQwofPwmULI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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