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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92066e44c6799627f9265b3b00bf2e9d2aaa206c1b9b0e2f7cae73a67e49616c' 
  AND token = 'i6RZNoPwdli/EHa8BFDpkFjETqd0TGFDAh2xUDh8LXg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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