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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02f29365d65b261ea8b9aa1b5fae57b302112672d26f4d1d4efc1adfa11264d3' 
  AND token = 'ss5sjJOihsWrCrc9myizgBVH5tlOCha6aWvHLWtf2SU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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