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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a032b40bfa29b45c73274d9d794e60b581ae2e914e1cc185b37df40f99ad1e04' 
  AND token = 'uxE5Gfa1u2mzFiDJafwYmt5pxw00a6B7lVq1Ny+bLC8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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