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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef672f43062e851335961da4bf70066e14f84bb50bb78f33ca4615c3fe5e4dce' 
  AND token = 'EEI8GN6enyCRDCFxZCgt0Fu4YHqdKj7oIvwtc84rhl4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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