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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b48a6331bbd274d47d78d1ffc41a0fedc47cb971bae2239a9c3d1a5084b5293d' 
  AND token = 'V93DIdobg5n6Zl1RlCBH2RC5hbmcAQW1iRF00N589qE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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