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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eedee08473cbf741a78b6f7b4897121510fd59be95b8c6d4e3613f0259dcccdc' 
  AND token = 'VabCf0jR0Epj5s0apjWFHoOShUuBS4qGeMayj9Ps40E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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