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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3dd0916f3a60b10a19991ece2bd66768e66161e7c107c1deb171b8bc77c4dbd' 
  AND token = '15Oyqs/ZMXUDutU0TsRRovYu3b9aL23zK4AkXJ+t3vc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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