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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9d9cbb50bbaabd765f27958e7b133709ce630fdf1a033869c64d5e5fe5f0e9a' 
  AND token = 'GV8yLxqLI8Mw+8RUJfJThkXh85cDRUOcb/GTpaQr4Ws=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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