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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd60b3206e3c9eaea6b85ae17cb80daa60eeb90b4ea65a4e0aade85abde4ee01b' 
  AND token = 'MeiYeoevdRrjjDvXoh0hP9TB0yAz+N8VH+3I8FAnXlQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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