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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a832b7868474c4123aba2fbac6dcefdd9a2f8e6d7ef4c386c837b007889d0bf8' 
  AND token = '8TlDMMxyr7IcDEjmVi5kn4ZMImvzQPI4f7FLcrDgDIo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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