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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7637a54c6ba238bdebe6d0033ebdecc5b509fe9d5a9dc35f20c7a85c61c71c04' 
  AND token = 'KyfRrm4DsDWBYc33cPu1LRI5i8H0iNDWTR8Nj+izTXk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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