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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6da889afc299033a04f9b07f9660f5b64b7bb496dd4795e2be27cee21056703b' 
  AND token = 'zDgx0Z+YPAVnRWk7Fc62iSoCFjHpEk3Q/YNTxrfzPMc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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