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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35f7023b923f615d95ac0ba1d252a5d2864b9da7507777e77a13827b6eed7221' 
  AND token = 'PEIMdMH3eH0isb9qNwhv2maNh/3zt7VJH66ko11CNkU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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