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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09324716d52d7eb3bd01f2c9ee3869c8e37058889f470ed604595e765d4956a0' 
  AND token = '4dwNv0P6Kku0Qn134GSl5jF/qqVR3zg5A3Nu+HQIzpc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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