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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f82c83b36359cdef960815330a560406a94d7cff7d33ecda1d654c08a644a3d3' 
  AND token = 'eEivR1guqymdh7OP8TZ+k6+JjEv6rD3LTcZpMvbXLFk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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