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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bdd24144cd2209dc4b9640f1545c7f32c0fe40828fff396f6bbfd8f01ef29a91' 
  AND token = 'NGd3J/myxrI0FGVJdcavry618PdgeCgqO7FPYBUFIqQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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