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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a682ebfbebe98fb8e5eedc54fb9564bf43e57c1f3c4a024b048765ce2e3b7da2' 
  AND token = '98iK0hsImXb6PBgsSdqdhSCMVS6D9m7dhhu0nW09H48=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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