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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9faf32f039fd157b01cc64c20e948b25051095788ec0997b7fe172a2822af14b' 
  AND token = 'QpqyGdflT7JaIJas413grzn6CjmRm7ZT0gPNzOr3Uts=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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