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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc302152348e8d5246c43eb4501ed626709239007394a59b3c440377f1563329' 
  AND token = 'RcuFA3+3E/VesfMHZw0ycEZ6XYvwZBGW6s1hODxkH3c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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