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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2052bc569fd21b18d42eb393719d1bf0303d5012aac0eeed45772e08d288513b' 
  AND token = 'upCFekuXDNLbMxX4x7uav3OzsxEFK0Uw+Tti7MJfgtM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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