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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '54a3edeb8f9867bd940c2d01d9f129672461bcf580f062b5c4d925b8abe36cbb' 
  AND token = '77Nhcy3v2CyCEtkkSWywKEwjfSVMEmqkPN/4ItLA4lk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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