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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e415d39bf476babf76c392ef85b022271fd31791735ad8e7ef38dc3a92b28208' 
  AND token = 'Csw4j9gd9rqMm6Fg5e+W+IlwV2+kShMBFQ5ae9iXOiI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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