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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41a0fa0f9b1b129f198b897725ae7c41ff8ab73b57c00cb59a70461a4d6c1cd2' 
  AND token = 'MGY7JZ9VHsQz64W66i+wcNzF66gGkDaR0bBxvuzk77w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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