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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0162631df8c00da358cef49f3859c7c145d32920c0932b10a2f0f6380de00eb' 
  AND token = 'Mocfi8uwZ5kopxpC1qWC5R5v1TMwM/dN2bD/wXtVh78=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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