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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '085462085ab9c492f826989e8af791ca4602c9f92d5afcde299aa7197d18d0b1' 
  AND token = 'hMgFXeBMa3sJtsOROIcvYdSVl/oStjqWwYcY2OlaMH0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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