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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02f9a4b945c184866522cab8d973fc3ae190435c7e3ec73b21b10c0383bb010b' 
  AND token = '9fBq+vPzSi6sbstFrIH8FbxPThyLXYmRIPdgWN50c6I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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