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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38d008365cc35ab123bfba7974c0e1fa2d4f7c1a7a8cec3a2aeb94623b4d1701' 
  AND token = 'w2YiSfGPYTsVwtBmupySu9Vfy0M9Yg/DQdHhS0qb0MA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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