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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1fa6264c64ab54c0cca03a706881220d4f81c08b7eb891fb07a060afd42d7bbf' 
  AND token = 'YQB5/wVZaiJhaDHF+ZJHuNy/p0TrSPY9T17WSSuNbkA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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