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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae003f7a6f8658e4d7bd637c44be142d84362e0ef3e9caae17927179c3378d3d' 
  AND token = 'Sdo0x0VglT+Z388YgBsxl4H87HSpOPMpKGHzC/3/LMg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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