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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '64e668acd3ecc8306cda019d1b50861d6f42b9ce55c1790fc7077fa3072ac80e' 
  AND token = 'InpxMv4/mQZEM6Ipq6jb6nbTn3uOADzX59Attns0nvU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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