SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9aa92cb9f9af4dd2f33c111b4d3e24ab93a9c52048a8adc538729d8ce2f2bc1a' 
  AND token = 'RYsmB6CVw6/2GqbcUZERqH++gMYD0P1IJrCp1zBhaII=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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