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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82f4b7aa0b9c8a68fce30d2ffcbc781e3c6bca5a2743e6d9a3df4a0f5d80dcc1' 
  AND token = 'rZe1j3LeBG+Vbd4qhwCyD5D8r21PsUxt8sgbBGIhbYg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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