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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e67441194328396d5d8468f72dd029b34dbeb834cb8191d98a6c596869b8bf93' 
  AND token = 'mCXHzNKL3+LyWP0+6JOlEGcAMMhiVy7gaNey72rvu9g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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