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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee9e0d2a8d2d86db9603a4b4a30563e604bad7aec4211b5030d112b4fb842f1c' 
  AND token = 'MA58ifwqjix+gELmFlwcBM48Bd3wJVKUoNRoMw58Z7o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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