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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20de867252feada02fbf70e96114a51633c9c8b7157739897cc4d76eb752b9a6' 
  AND token = '6tua+D1T6qkbh78DQ7P21SNlsWPWUnWHFDYnY3AAkh4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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