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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1e0b68d4dc528a00069bc97744fd33a7312a4aa1af12da426483ea8539dec92' 
  AND token = 'W6/3w9KyA+ryKPgBsa71d+ChEHcvWK1ECDczDaTldJE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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