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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4ed453cb3f86dc3f63c1b0bd4a1d7d3c59b410590670b48207e6a91466ef96a' 
  AND token = 'oBxk6y4/1NgeI2ykAts7H2KrYiRGSQO2hiWxlN7GaV0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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