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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c06d8123ca0517af0c38a9c9a7ea77b589d729851da05e07e9656f667266291d' 
  AND token = '6KRDllmGR9kT7yfFUnxoSXe4BsMdGYJ9Q6TqWrja3rE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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