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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '870913bb321b33d18a69f9f45343e402f624d8a5b837b52321763ff6d1f2f146' 
  AND token = 'AhGMKH0qQeqi9fltREfDfT3cM5vmsC6Y0TZyn25mk5g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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