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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee6a454ef9b3bb352eacc2ecadd171a15d1dab583970eedede13687af54f53ea' 
  AND token = 'EHvZMpLpoVa3MAZ2Ocklvj5YQ0lRiNJlIrFupDMW6DY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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