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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d5adc13989c7ea5d794812b862a87657b6e74a55afd5a98f9156e71c55f6fbe' 
  AND token = '2Wa0VMzR9F3PyY9UK6U8fIzll+vEL+Z9Ch4uUUDITYI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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